Visitors relax on Cannon Beach at John Pennekamp Coral Reef State Park in Key Largo, Fla. Besides being the nation’s first underwater preserve, Pennekamp features two beaches, a campground, boat ...

Snorkel, swim, sail, and sunbathe in this tropical paradise. One of Key West’s best-known beaches is also its largest. Located on the south coast of the island, Smathers Beach is a half-mile long and ...